The hard course of wall reform by gradual cancel of clay brick in China is retraced and the problems in housings from small concrete hollow blocks at early age are pointed out, such as 'bad thermal performance, cracking and permeability' etc. The way for development of block manufacture with own characters is suggested, that is, multi-hole concrete hollow block with module of clay brick produced by centrifugal technology of molding. Preliminary tests show that in respect of the strength, thermal performance and even technology, the block is better than the clay brick.