Conventional SAGD is aimed mainly for the heavy oil reservoirs with thick formation and high viscosity. Haqian1 block has the geological features of thin formation and super heavy oil. Based on conventional SAGD，3D physical simulation experiment technology was applied for the research on adding nitrogen gas and dissolve agent to improve the development effect of the conventional SAGD. The results show that nitrogen gas can release the steam overlap and lower the steam chamber pressure，resulting in expanding the effective sweep area of steam chamber. Dissolve agent can decrease the viscosity further with the steam carrying，leading to quantitative change of steam chamber development and producing the reserves of lower reservoir effectively. Nitrogen gas and dissolve solvent aided SAGD can respectively increase the cumulative oil steam ratio by 0.036，0.023 mL/mL，and increase the oil recovery by 10.9% and 6.9%，compared with those of convention SAGD and nitrogen gas aided SAGD. In a word，nitrogen gas and dissolve solvent aided SAGD technology can obtain impressive effect.