how to solder ASP-122952-01(HSMC) by hand?

You might consider an industry standard LF solder profile. Or review the Samtec QTH series specification http://www.samtec.com/documents/webfiles/technical_library/qsh-qth.pdf

The problem is that you can't hand solder the ground strips under the component body. (Or you'll want to implement special PCB tricks like large through plated vias to heat it from the backside.) Conductive epoxy would be another option.

For prototype assembly, I always reflow solder components like this on a hot plate, in case of need in my kitchen.

My past experience soldering a similar QTH connector by hand has been that its really hard to get a reliable solder joint and you end up wasting more time and money than just having it stenciled and reflowed somewhere. In the end you'll be questioning whether bugs you see are in your code or in the connector!

If you still want to do this, then what I did was I soldered wires to the ground tabs underneath the part so that they came out the side through a notch I had made. Obviously this leads to a really bad ground loop and goes against all good design practices but it worked for me because I was running at slow speeds and it was a test board. I also had an awesome technician with decades of soldering experience doing some of this for me.

thanks FvM & srt amol!

I will try to solder it !

thanks again.