To satisfy many requirements of next generation cellular system the massive MIMO techniques have been proposed.In this paper the performance of linear precoding tech-niques such as maximum ratio transmission(MRT),zero forcing(ZF),regularized zero forc-ing(RZF) and truncated polynomial expansion(TPE) are analyzed and compared in downlink massive multiple input multiple out put system.In this work we want to reduce the computational complexity in massive MIMO system.the proposed technique called truncated polynomial expansion(TPE) precoding.It can emulate the same advantage of RZF by using random matrix theory also have been drive aclosed-form expansion of the SINR under TPE precoding.Finally we have been compared and analysis under the same assumption and consideration of ZF,MRT,RZF and TPE using two lower orders and one higher order with RZF under the imperfect channel state information.We have observed that the proposed TPE can provid the closest match to RZF,while the computational complexity is lower. Key Words: Massive MIMO , ZF, MRT, RZF, TPE, Pre-coding techniques