For Plan 1.1
- Graduated in M.Sc. or M.Eng in any field related to environment.
- GPA of at least 3.50
- Prove of English proficiency as required by the Graduate School of Mahidol University
- Have at least 5 years of experiences in conducting research related to environment in a principle investigator or co-investigator roles. Having the research articles or any types of articles  published in the international peer-reviewed journals of at least 3 articles within 5 years. These articles must not be used to fulfill the graduation from both domestic and international academic institutes.  
- Applicants with qualifications out of these requirements may be considered to pursue their study in the program by the head of the program and the dean of the faculty of graduate studies.

For Plan 2.1
- Graduated in M.Sc. or M.Eng in any field related to environment.
- GPA of at least 3.50
- Prove of English proficiency as required by the Graduate School of Mahidol University
- Applicants with qualifications out of these requirements may be considered to pursue their study in the program by the head of the program and the dean of the faculty of graduate studies.

For Plan 2.2
- Graduated in B.Sc. or B. Eng in any field related to environment .
- GPA of at least 3.25
- Prove of English proficiency as required by the Graduate School of Mahidol University
- Applicants with qualifications out of these requirements may be considered to pursue their study in the program by the head of the program and the dean of the faculty of graduate studies.