The promotion of major general to lieutenant general is a way to promote middle and senior officers in the army, which usually requires the following conditions:

1. qualifications and experience: promotion will usually require at least 20 years of length of military service, rich military experience and outstanding performance.

2. Education and training: promotion usually requires higher academic qualifications and professional knowledge, and passes the corresponding training and assessment.

3. Ability and quality: promotion usually requires high leadership and comprehensive quality, including organizational ability, coordination ability and decision-making ability.

4. Rank and rank: promotion will usually require a higher rank and rank, and pass the corresponding assessment and evaluation.

It should be noted that the promotion of major general to lieutenant general is not inevitable, and corresponding conditions and procedures need to be met.