1, simplified mnemonic method: simplify complex content, discard secondary content, remember key words, then expand, and finally achieve full memory.

For example, the Sino-British treaty of nanking is hard to remember, but after careful consideration, there are four articles in this treaty. If you find a keyword for each article, you can first simplify it into four words: "cut, compensate, open and close", and then expand.

2, formula memory method: For complex historical problems, you can sum up the basic formula, and then answer according to the formula, which is convenient to sort out the problem-solving ideas.

Commonly used historical formulas are arranged as follows:

(1) Historical events = time+place+people+simple process+result+meaning.

(2) After = preparation+occurrence+result.

(3) Meaning = function+characteristics+influence.

(4) People = name+times+deeds (including thoughts, activities or works)+influence.

(5) Works = author+year of writing+content+meaning (or influence).

3. Comparative memory method: it is to classify and compare events or people with certain connections, find out similarities and differences, and prevent arrogance. Specific practices are as follows:

(1) Compare historical phenomena with the same nature but different characteristics.

(2) Compare some historical phenomena with similar performances but different natures, distinguish different natures and clarify different concepts.

(3) Comprehensively compare historical events of the same nature but occurring in different periods, and distinguish similarities and differences. For example, many unequal treaties in modern China and their influence on China society.

(4) Comparison between China and foreign countries. Such as the comparison between China's ancient economic and technological development and the West.

4. List chart method: According to the characteristics of historical events, the same kind of knowledge is linked together in the form of tables and charts to form a system to make the content clear and coherent. The biggest advantage of the list method is that it is concise and eye-catching, and it is an effective method to help memory, especially in the memory of complex historical materials.