It is legal for medical institutions to organize training courses by themselves, but they need to abide by relevant laws, regulations and rules. According to the "People's Republic of China (PRC) Health Law" and "Regulations on the Administration of Medical Institutions" and other laws and regulations, medical institutions can carry out medical education, training and scientific research activities, but they must meet the following requirements:

1. The training content must comply with national laws, regulations and industry standards, and cannot violate medical ethics and professional ethics.

2 training institutions must have corresponding qualifications and conditions, including teaching facilities, teachers, teaching materials and teaching management.

3. Training institutions must carry out filing or examination and approval in accordance with regulations and obtain corresponding licenses or certificates.

4. Training institutions must teach in strict accordance with the training plan and syllabus to ensure the quality and effect of training.

In short, it is legal for medical institutions to organize training courses by themselves, but they must abide by relevant laws, regulations and rules to ensure the quality and safety of training.