you can't apply LTSVP online
Social Visitor Whose Child (above the age of 21 years old) Is A Singapore Citizen (SC) or Singapore Permanent Resident (SPR)

* A copy (original) of duly completed Form 14, Form V39I (Form V39I is only for non-Malaysians). You will require Adobe Acrobat Reader to read and print the form. Download may take a while;
* 1 recent passport sized colour photograph which meets the following requirements to be pasted on the top right-hand corner of Form 14:
o The photograph image must be taken within the last 3 months;
o The photograph should be in colour, must be taken against a white background with a matt or semi-matt finish;
o The photograph image must show the full face and without headgear (headgear worn in accordance with religious or racial customs is acceptable but must not hide the facial features);
* Sponsor's birth certificate (original and photocopy);
* Sponsor's identity card (original and photocopy);
* Applicant's valid travel document.
* Sponsor's highest educational certificate (original and photocopy);
* Sponsor's letter of employment stating date of commencement, designation and salary per month (for self-employed: sponsor's valid Registration Certificate from the Accounting and Corporate Regulatory Authority (ACRA) and Company's Profit & Loss Statement for the last 12 months);
* Sponsor's Income Tax Notice of Assessment for the last 3 years (original and photocopy);
* Sponsor's CPF Statement showing monthly CPF contribution for the last 12 months;

(The original and photocopies of the above documents are required)
*

Note: Application must be sponsored by the child above the age of 21 years old.

父母不在新加坡,我可以先帮他们办好Long Term Social Visit吗?
rt

谢谢

may not
if i am not wrong, parents have to be present when submitting the documents

Can not.
Parents have to be in singapore.

and need to apply social visa for them then can get the LTSVP.

just take a note that your parents passport expiry date :(