The fluorescence-of Cu,+, and Eu,2+, coactivated CaS is reported. The emission bands of Cu,+,and Eu,2+, peaking at 430 nm and 630 nm were originated from Cu,+, transition of Cu',Ca,-V,s,2+, centers and 5d-4f transition of Eu,2+,respectively. The dependence of luminescence properties of Cu,+,nd Eu,2+, on their concentration was investigatad. The emission of Eu,2+, is sensitized by Cu,+, and the peak wavelength and intensity of Cu,+,-emission band are affected by Eu,2+,. The experimental results indicate that there exists effective energy transfer from Cu,+, to Eu,2+, in CaS host. CaS·Cu,+, and CaS·Eu,2+, are good red-light transition agent and blue-light trasition agent for farm film,respectively. The absorption spectrum of chlorophyll photosynthesis can be imitated-by light transition film for farm using CaS·Cu,+,Eu,2+, phosphor as additive,Which can make the crops growth in the environment of function spectrum of the best growth of plants,and promote its growth or increase yield.