>My existing way is after input the filtering requirement from a form, I felter the table and show the result in another form. Then I use
>sum evaluate(thisform.grid1.column1.controlsource) to total_value
>in the form and in a report I add the field which will display the total_value. How can I skip the second form and calculate the total of a field in a report after the filtering?
>Thanks for help.

Go to the properties of the field in the report(right click) and click calculations... then sum or whatever you want to calculate.