Thank you all the prefessors talking about this subject.

I took a look the website and click on keyword "blindTrust"
here comes the definition of the following:
"A blind trust is a trust in which the executors or those who have been given power of attorney have full discretion over the assets, and the trust beneficiaries have no knowledge of the holdings of the trust. Blind trusts are generally used when a trustor wishes to keep the beneficiary unaware of the specific assets in the trust, such as to avoid conflict of interest between the beneficiary and the investments. Politicians often place their assets in blind trusts so they cannot be accused of conflict of interest when they direct government funds to the private sector."

If a politician chooses the executors with his personal interests
in mind and execute the way in the best interests of the
beneficiaries, it still can not be called impartial system.
In my opinion, the politician should put their "interests" frozen
and after the job the interests be released at its original status. If you loss money, that is a politician has to pay; if you increase your value, that is your luck. Nothing should be involved in the transaction during the politician stays in the office.