The invention discloses a method for improving the acid soil condition by using a matrix and belongs to the technology field of the soil improvement. The method is composed of seven steps including matrix preparation, pH value measurement, matrix amount confirmation, matrix applying time, soil humidity control, matrix applying operation and pre-plant soil preparation. The matrix is made from imperatoria and prepared by adopting the technological processes of drying, chopping, fermenting by using the Dadiwang viable bacteria stock solution, etc., wherein the imperatoria is suitable for being planted in the tropical area, and has rapid growth, high yield and sustainability, and the required matrix total amount of the soil improvement can be figured out by confirming the required matrix amount of neutralizing 1m<2> of the acid soil. The matrix is quantificationally mixed with the acid soil for more than two times. The method can effectively change the pH value and the physical behavior of the soil and can increase the soil fertility; the pH value of the soil can be directly increased from 4-6 to 6-8, so that the acidity and basicity of the soil is suitable for the plant growth; the soil bulk density is reduced by 10%, the soil porosity is increased by more than 15%, and the water holding capacity of the soil is increased by more than 20%.