Under the assumption that the product of two spin operators decomposes uniquely into the degenerate conformal fields $\left\{{\Phi }_{n^{\prime },n}\right\}$, the general expression for the correlation function of four spins is defined for the q states Potts model with q taking general values in the interval $1\le q\le 4$.The limit of $q\to 1$ is considered in detail and the four spin function is obtained for the percolation model.