The key to the systematic desensitization method is to establish a system of graded exposures so that the patient can gradually adapt and overcome his or her fears.

1. The key to the systematic desensitization method is to identify the source of the patient's fear or anxiety. The therapist needs to communicate y with the patient to understand their specific fear and anxiety situation in order to develop an individualized treatment plan.

2. Establishing a graded exposure system is central. This system starts with lower-level anxiety situations and gradually increases in difficulty until the patient is able to face the highest level of fearful situations. This gradual approach helps the patient to gradually adapt and overcome the fear.

3. The success of the systematic desensitization method also depends on the patient's active cooperation and trust. The therapist needs to establish a good cooperative relationship with the patients, encourage them to actively participate in the treatment process, and believe in their own abilities and potential.

4. Continuous support and feedback are also key. Therapists need to give patients continuous support and encouragement during the treatment process to help them cope with possible setbacks and difficulties. Timely feedback on the patient's progress and achievements will enhance their self-confidence and motivation.

Disadvantages and limitations of systematic desensitization:

1. Longer treatment time: Desensitization therapy requires some time and patience as tolerance needs to be built up gradually. The length of treatment depends on the patient's specific situation and the therapist's program.

2. May trigger allergic reactions: During the course of desensitization therapy, patients may experience an allergic reaction, which requires the therapist to closely observe and take appropriate measures. Some patients may need to stop treatment or reduce the dose.

3. Not for all patients: Desensitization therapy may not be suitable for all patients, especially those with severe allergies or immune system disorders. A thorough evaluation is required prior to treatment to ensure that the patient is suitable for this therapy.

4. Need for professional guidance: Desensitization therapy requires professional guidance, including a doctor or therapist. Patients need to be under the supervision of a doctor and follow their advice and instructions.

5. Possible tolerance: In some cases, patients may develop a tolerance to desensitization therapy, which means they need more doses or more frequent treatments to get the same effect.