The improvement of Eurasian 500hPa ten days average prognostic eqaution has been improved with NWP product, besides the spatial-temporal scale, predictions among grid by grid correlation from Eurasian to the northern hemisphere,the climate geographical distribution of the long-wave weather system and the methods of teleconnection analysis etc. were chosen for the critical region, to construct new prognostic equation. A comparison betweenthese two prognosis, the forecast accuracy of the new prognosis was improved respectively,0. 15-0. 20 and 0. 10 on forecast height and position of the long-wave weather system.