Semi-hydrogenation of alkynes to alkenes represents an important transformation in organic synthesis and has been widely used in the fine chemical industry and petroleum industry. It is well known that alkyne could be hydrogenated to alkene easily using transition metal catalyst (Pd, Pt, Rh, Ru, Ir), but normally with undesired over reduction product alkane. In the olefin industry, the alkene is the crucial substarting marital for the synthesis of various valuable products like rubbers and plastics. However, during the selective hydrogenation of alkyne to an alkene, starting material alkyne and the over-reduction product alkane are the impurity and harmful components which poisoned the subsequent alkene polymerization process. So, the developments of controllable excellent selective hydrogenation of alkyne to the alkene, which can lower alkyne concentration and increase desired alkene product, are of great importance. PdNPore (Bao et al. Up to now, a variety of high efficient transition metal catalysts have been developed and applied in the semi-hydrogenation of alkyne to the alkene, and some of them have been widely applied in industry. Precious transition metals like Pd, Rh, Ir, Au were widely used in the semi-hydrogenation of internal alkynes, which normally favored Z-selectivity. Recently, many Pd, Au, and Ru catalyzed selective semi-hydrogenation of terminal alkyne, which has been recognized as more challenging substrates than internal alkyne in semi-hydrogenation, have been developed and showed good to excellent catalytic activity and selectivity. Kaneda and coworkers made a great contribution to the Core-Au/Shell-CeO2 catalyst for the semi-hydrogenation of alkynes. They prepared the novel core-shell nanocomposite Au@CeO2 catalyst using a facile synthesis redox co-precipitation method through the spontaneous redox reaction between Au(III) with Ce (III) to Au (0) and Ce (IV). The core-shell structure was important for the catalytic activity and stability, it can minimize the exposed surface Au sites and maximize the coreshell interfacial sites. Under mild reaction conditions (Au@CeO2 (Au: 10 mol%), r.t., 30-50 atm H2), various alkynes including aromatic, aliphatic terminal alkynes, and internal alkynes were transformed to alkene product with good to excellent selectivity (72 ~ >99%) (Scheme 1a). In 2017, Bao and co-workers reported a heterogeneous palladium(Pd(0)NPore) catalyst for semi-hydrogenation of terminal alkynes. Ten terminal alkynes including aromatic and aliphatic substrates were converted to the desired terminal alkenes in 75~88% yield under mild conditions (1 atm of H2, rt). One equiv. NaOH and 16-20 h reaction time were necessary in all the cases (Scheme 1a). Recently, Lu et al. reported a novel system containing both active metal Rh (0) and promoter ion Ga (III) on metal-organic framework (MOF) support. The promoter Ga (III) could dramatically affect the semi-hydrogenation selectivity of the Rh-Ga@NU-1000 catalyst via the electronic (decreasing Rh electron density and making it more electropositive) and structural effect (limiting number of available coordination sites at Rh). Unlike the previous report, the Rh-Ga@NU-1000 catalyst favored high selectivity of E-alkenes from internal alkynes, and also could selective semi-hydrogenated more than 10 examples of terminal alkynes to alkenes with 80 ~ 89 % yield (Scheme 1a). Compared with the abovementioned precious transition metal catalysts, earth-abundant transition metal catalysts like Fe, Co, Ni (Scheme 1b) also showed promising application in the semi-hydrogenation of alkynes, especially with their obvious advantage in economic cost and bio-safety requirements. However, when concerning the most costeffective and promising heterogeneous supported earth-abundant transition metal catalysts, the unstable and gradually weaken metal-support interaction causing active metal species aggregation during reactions are generally one of the most factors which restrict their wide application in industry. Moreover, the supported metal-based catalysts also suffer from active species leaching in acids or other harsh reaction conditions, results in poor reactivity and selectivity in challenging synthetic organic reactions or poor stability. To solve these problems, recently, the core-shell, yolk-shell structure catalysts that encapsulate active metal nanoparticles (core) with support (shell) maintaining the high activity and stability of metals in the acidic medium are proved to be novel and promising and has recently been applied in a variety of catalytic systems. Graphene has been widely used as catalyst support due to its unique properties of thinnest, hardest, thermal and electrical conductivity. But the previous prepared graphene encapsulated catalysts generally have multi-layer of graphitic shell which reduced the catalytic reactivity, hence searching and developing advanced synthesis methods for thin graphene layers especially for twisted bilayer, three-layer graphene with superconductivity are of great interest. Herein, we report a facile and environmentally friendly synthesis of thin graphene shell encapsulated nitrogen doping Ni@N/C catalyst using nickel nitrate and melamine. The catalyst's chemical composition, morphology, phase structure, and its catalytic semi-hydrogenation of terminal alkynes are studied in detail.