Abstract:In order to have a more systematic understanding of image encryption technology based on chaos theory, a simple study is carried out. Chaotic cryptography has received more and more attention due to its lower mathematical complexity and better security. It successfully avoids data expansion, which reduces transmission cost and transmission delay. The digital image encryption technology based on chaos theory utilizes the principle of discrete nonlinear system dynamics called chaotic mapping. According to the type of system, multiple types of Chaotic map can be used. Through summarizing the existing encryption technology based on chaos theory, And carrying out the related experimental research. We look for similarities and differences, as to seek further understanding of this field.