‘Weisheng No.3’ is a new cucumber rootstock with characteristics of developed roots，high absorbing capacity of water and fertilizer，strong plants，the resistance to low temperature and weak light.Stock and scion has good graft compatibility and symbiotic affinity.Scion-root seedling of cucumber had high survival rate.After grafting with cucumber，its fruit is with shiny dark green skin，straight，without wax，all of which improved the appearance quality.It can promote its growth and enhance its yield，resistance to damping-off，fusarium wilt and downy mildew.It is adapted to protected cultivation in early spring and for autumn-winter in northern China.