The present disclosure provides a neural network weight matrix adjusting method, a writing control method and a related apparatus, The method comprises: judging whether a weight distribution of a neural network weight matrix is lower than a first preset threshold; if yes, multiplying all weight values in the neural network weight matrix by a first constant; if no, judging whether the weight distribution of the neural network weight matrix is higher than a second preset threshold, wherein the second preset threshold is greater than the first preset threshold; and dividing all weight values in the neural network weight matrix by a second constant, if the weight distribution of the neural network weight matrix is higher than the second preset threshold; wherein the first constant and the second constant are both greater than 1, thereby improving the operation precision.