The s ocial security functi on of rural land is existed in the traditi onal way of the rural social security . For a l ong ti me, it holds the i mportant status in the rural s ocial security . While rural s ocial economy devel op ing, the security functi on of land is weakening . At p resent, for shortage of realistic foundati on of establishing the comp rehensive s ocial security, so the rural s ocial security can not comp letely be separated from land . It is need for China’ s devel opment and stablizati on t o research the durati on of the security functi on of land . The author in this article exp l ored the synergy of the security functi on of land with land transacti on, discussed the way and method t o continue the security functi on of land for three kinds of farmers including far mers who l ost land, farmers who work infact ories and farmerswho still stay at farming .